Improvement in bolt-heading dies



. F. MUTIMER.

BOLT HEADING DIES.

Patented June 20,1876.

UNTTED STATES PATENT FFIQE.

FREDERICK MUTIMER, OF ROCKFORD, ILLINOIS.

IMPROVEMENT IN BOLT- HEADING DIES.

Specification forming part of Letters Patent No. 179,044, dated J one 520, 1876; application filed May 19, 1876.

v To all whom it may concern in. which Figure l is a perspective view of my improved dies as they appear when closed together. Fig. 2 is a like view of the same separated from each other, and the sections of each detached. Fig. 3 is a perspective view of a bolt-blank as cut from a bar. Fig. 4 shows the same after having passed through the first operation, by which the square shank is formed; and Fig. 5 is a perspective view of the finished bolt.'

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to. enable square-shank carriage-bolts to be produced fromround bar-iron with greater ease and at a less cost than has heretofore been practicable; and to this end it consists, principally, in the method employed, substantially as and for the purpose hereinafter specified.

It consists, further, in the peculiar construction of the upper or movable die, substantially as and for the purpose hereinafter set forth.

It consists, finally, in the combination of the movable and stationary dies, substantially as and for the purpose hereinafter shown and described.

In the annexed drawings, A represents the movable die, which has, preferably, a rectangular form, and is provided upon one end with a shank, B, by means of which said die is secured to or within the operative mechanism. Within the end of the die A opposite to the shankBis formed an opening,O,that extends from said end longitudinally into said die to any desired depth, is made square in crosssection for a short distance from its outer end, and from thence to its inner end is round, said squared and round portions corresponding, re spectively, in transverse dimensions and shape to the like features of the shank and body of the bolt to be formed. In order that the opening G'may be more easily construeted,a rightangled block, A, is removed from one corner one-half in each of the contiguous faces of said die A and block A. After the completion of said opening 0, said block A is securely fastened in place by steady-pins a, or any desired means whereby it will be firmly held in position, and caused to become substantially a solid portion of said die. The opening 0 is placed at one side of the axial center of the die, and in a corresponding position upon the opposite side of said center is formed a semispherical depression, D, that corresponds in form and dimensions to the like features of the upper face of the bolt-head that is to be formed. The combined stationary and holding die is formed of two blocks, E and E, which have equal dimensions, and when placed together correspond in cross-section to the size and shapeof the die A, but have considerably less longitudinal dimensions. The line of division between the blocks E and E coincides with the axial centers of the opening 0 and depressions D, and within the inner face of each of said blocks are formed one-half of two openings, 0 and D, the first of which, C,has

a squared portion at its outer end, and from thence to the opposite ends of said blocks is round, while said opening D is square throughout its entire length. The die E E is secured within'a suitable bed, and arranged so that its sections may be separated for the purpose of receiving a blank, and then closed together so as to firmly grasp the same, while the die A is arranged to move longitudinally, so asto cause its face to impinge upon the-face of said fixed die, all in the usual manner.

The dies are now ready for use, as follows: A blank, F, is cut from a bar of round iron, which corresponds in transverse dimensions to the diameter of the body of the finished bolt, and, after being properly heated, is placed within the opcningUof the holding-dies, and the latter then caused to close upon and firmly grasp said blank. The movable die is now caused to impinge upon the holding-dies, and in such operation receives the projectingend of the blank F within the opening 0 5 but as the latter has a less depth than the length of. the former outside of the holding-dies, said blank is compressed lengthwise, and, as it closely fills the round portion of said opening, is prevented from upsetting, except within the squared portion. length of the blank outside of the holdingdies, the exact quantity of metal necessary to fill the squared portion of the opening can be secured, and the square shank of the bolt formed without waste. The blank F is now transferned to the opening D of the holding dies, and the movable dies caused to impinge upon it, when the end of said blank will be upset, and, by means of the depression D, caused to assume the form of a button-head, f, as seen in Fig. 5.

It will of course be seen that in order to form said head without shortage or waste it e is necessary that the precise quantity of metal required should be left outside of the shank f; but such adjustment of length is easily and quickly made, and, once.etfected,nwill not require change.

It is found that the best resultis secured by forming the principal portion of the shank f at the first operation, and completing said shank when the head is formed, there being less liability to the production of a cold-shut under said head than would otherwise be the case.

By properly gaging the Having thus fully set forth the nature and neritsof my invention, whatI claim as new 1s---- 1. The hereinbefore described method of forming carriage-bolts, by first upsetting the central portion of aronnd blank, so as to proportion, A, removable upon a. line with the axial center of said opening, substantially as and for the-purpose set forth.- a

3. The, movableor swaging die A A, provided with the opening 0 and depression D, in combination with the combined stationary and holdingdie E E, having theopenings C and D, substantially as andfor the purpose shown and describe In testimony that I claim the foregoing I have hereunto set my hand this 13th day of May, 1876. a

FREDERICK MUTIMER;

Witnesses S. B. WILKINS, A. MAROELLUS. 

